Light fixture with a linear lighting field, suitable for forming lighting trunking

ABSTRACT

In a long field lighting fixture or lighting fixture with a linear lighting field, which is capable of forming a light screen or row of light fixtures that is reduced to its functionally critical parts, the lamp housing is composed of a single-piece reflector arrangement that is fashioned mirror-symmetrically with reference to a vertical middle lamp plane. This is composed of a thin-walled material whose surface is finely structured in a stiffening fashion by surface shaping at least in sub-areas. Facing away from its light exit opening, the reflector arrangement also comprises a pair of outwardly salient, mutually spaced legs, which are spaced apart by a cover surface, for the acceptance of electrical and/or mechanical lighting fixture component parts. Connector elements for a screen arrangement are formed either by end face parts or plates of the lighting fixture itself or by individual elements. To that end, the end face parts comprise a plug channel on an inside surface facing toward the reflector arrangement which channel corresponds to the profile thereof. A tongue and groove profile is provided on the outside surface by which two end face parts can be joined in one another and align a pair of fixtures with identical contour. Further structural elements and components of the lighting technology supplement the lighting fixture structure to form a lighting fixture system.

BACKGROUND OF THE INVENTION

The invention is directed to a long field lighting fixture or lightfixture with a linear lighting field, which is capable of forming alight screen and has a trough-shaped lamp housing securable to theceiling of a room via suspensions or directly at whose end wallsconnector elements are provided for optionally joining individual longfield lamps directly to one another to form a light screen or a ribbonof light fixtures.

Lighting equipments for large-area rooms are often realized in the formof light screen systems wherein a plurality of lighting fixtures, arefrequently placed directly against one another, to form a straight-linelighting fixture system that appears closed. In large-area rooms such asassembly, manufacturing or storage halls but also in sports arenas, suchlight screens are preferably arranged in a longitudinal direction ofsuch a room, and also in a plurality of rows parallel to one another.

EP-B1-0 486 714, for example, discloses light screen systems of saidspecies. The bearing structural element in such a light screen system isa carrying rail having a length that can accept a plurality of lightingfixture inserts. A through wiring is usually provided in the carryingrail for the electrical supply of the light sources. The lightingfixture inserts often have a base member with an essentially flatcarrying plate that is attached to the carrying rail during assembly ofthe light screen and is secured thereto with turn-lock fasteners. Thecarrying plate serves as a receptacle for all electrical as well asmechanical elements of a lighting fixture. All of these elements exceptlamp sockets are thereby preferably pre-mounted on the upper side of thecarrying plate and arranged such that they immerse into thecross-section of the carrying rail when the lighting fixture insert ismounted. In many known light screen systems, a lamp reflector, a lamphousing together with grid or a lamp covering are individuallydetachably secured to this carrying plate of a lamp insert. The sameturn-lock fasteners with which the carrying plate itself is to be fixedto the carrying rail are often employed for the fastening.

As a result of its modularity, this known structure of the light screensystems enables an extraordinary flexibility in the lighting fixturearrangement and selection, so that individual lighting jobs can besolved in different ways with such light screen systems. Added theretois that, due to their modular structure, such light screen systems canalso be adapted without further ado to changing demands made of the roomlighting, for example given a different room use. One disadvantage ofthis basic format of known light screen systems having a plurality ofindividual components is the relatively high outlay caused by theinherently desired modularity, this being expressed in the tool,manufacturing and warehousing costs.

As derives from DE-C1-43 42 657, this disadvantage has already beenrecognized. This document discloses a lighting fixture unit for lightscreen systems whose special characteristic is that an illuminationmeans therein, particularly in the form of one or more fluorescent lampsarranged in a lighting fixture unit, is no longer fixed to the carryingplate of the lamp insert but—via lamp sockets—is directly fixed to thecarrying rail of the light screen system. This known lighting fixtureunit for a light screen system thus foregoes a carrying plate insertedinto the opening of the carrying rail, i.e. the plate is eliminated.Instead, the reflector unit of the lamp insert serves directly as acovering of the carrying rail that is open in the direction toward theilluminated surface. In order to be able to realize this simplificationof the structural format of a lighting fixture unit for a light screensystem, all electrical and mechanical components of a lighting fixture,including the sockets for the illumination means, are directlyintroduced into the free cross-section of the carrying rail and fixedthereat. The reflector arrangement with which the carrying rail iscovered at its surface directed into the room must then be fashionedsuch that the sockets secured to the carrying rail can be pluggedthrough the reflector arrangement or, respectively, that correspondingcutouts for the acceptance of the plug-in sockets are provided at theirend edges.

Given this known solution, a certain disadvantage must be accepted inview of the assembly and maintenance friendliness in order to achieve asimpler and, thus, more cost-beneficial lighting fixture structure.Viewed from this point of view of cost benefit, however, the knownsolution can still not fully satisfy because the elimination of only acarrying plate means a relatively slight cost reduction compared to thedisadvantages of less of a scope of variation thus accepted.

Further, lighting fixtures capable of forming a light screen are knownand have a trough-shaped lamp housing which is either directlyattachable to a ceiling or held by suspensions and the fixture hashousing wall parts at the face side that can be directly attached to oneanother for forming a light screen or a row of light fixtures. Acarrying rail is not utilized given these lighting fixtures; instead,the housings of the individual lighting fixtures are fashionedcorrespondingly stable and such that, in addition to accepting theillumination means and the reflector arrangement surrounding them, theyalso accept the electrical and mechanical component parts and alsoenable a through wiring when employed in a screen arrangement.

U.S. Pat. No. 3,599,911 discloses an example of such a lighting fixturecapable of forming a light screen. Therein, end wall parts of the lamphousing are fashioned as punched sheet metal parts with angled-off edgesvia which they are secured to the lamp housing with screws or rivets. Inorder to be able to mutually anchor the end wall parts, the end wallparts have hooks and eyelets arranged in alternation. For joining endwall parts, these must first be placed against one another offsetrelative to one another in a transverse direction so that the hooks canbe introduced into the corresponding eyelets. A transverse motion of thejoined end wall parts is then required for locking the hooks. Theassembly process for a light screen is therefore relatively involved andrequires an additional adjustment in order to achieve an exact alignmentof the joined lighting fixtures.

EP-B-0 264 857 also discloses a long field lighting fixture capable offorming a light screen wherein terminating plates are provided asadapter elements at the end walls of the lamp housing whose outsidescomprise plug in frames respectively joining into one another in thefashion of stackable elements. Long field lighting fixtures can thus beattached to one another aligned by simply plugging the outsides of theseterminating plates together. However, a further end cap is then requiredfor the end-face termination of a single lighting fixture or the end ofa light screen.

SUMMARY OF THE INVENTION

The present invention is based on the object of creating a furtherembodiment of a lighting fixture capable of forming a light screen or arow of light fixtures which have a trough-shaped housing, which iseither directly securable to the ceiling or can be suspended therefromand which has end wall parts with means for connecting fixtures one toanother in a row. The fixture can be especially cost-beneficiallymanufactured in the limitation to purely functional features but therebynonetheless offers contemporary lighting technology in an attractivelighting fixture design and, at the same time, can be comfortablyutilized by the assembler and without tools, potentially in a screenarrangement as well.

In a lighting fixture capable of forming a light screen of theaforementioned species, this object is inventively achieved by thehousing being formed by a single reflector arrangement, which isfashioned mirror-symmetrically with reference to a vertical middle lampplane containing the longitudinal lamp axis, said reflector arrangementbeing fabricated of a thin-walled, web-shaped reflective material whosesurface is finely structured in a stiffening fashion by surface shapingat least in sub-areas and, facing away from a light exit opening of thehousing, comprises a pair of outwardly salient, mutually spaced legs forthe acceptance of electrical and/or mechanical lighting fixturecomponent parts and by connector elements that are respectivelyfashioned as a universal single-part end face part whose inside surfacefacing toward the reflector arrangement comprises a plug channelcorresponding to a profile of the reflector arrangement and whoseoutside surface has a tongue and groove profile composed of a pluralityof channels and tongues of identical width that are parallel to oneanother as well as to the center plane of the lighting fixture andfollow one another in alternation, said tongue and groove profile beingarranged to be asymmetrical to the center plane of the lighting fixtureso that identically fashioned end face parts are joinable in one anotherat the end side in pairs and aligning with the same contour.

Compared to the initially cited, relatively involved, known solutionsfor light screen systems having lighting fixture units introducible intocarrying rails, this inventive solution has the great advantage of anespecially simple structural format. It can be utilized both as anindividual lighting fixture as well as in a light screen withoutrequiring additional component parts for assembling the light screen. Itoffers the advantage of the rail systems of a ceiling-side arrangementof the electrical and mechanical component parts of a lighting fixturewith a simple through wiring in a light screen arrangement. Compared toconventional lighting fixtures capable of forming a light screen, it isthereby especially simple in its structural concept. A carrying rail, asin known ceiling/rail systems, is not required, even given a screenarrangement. A stable lamp housing is usually required in conventionallighting fixtures capable of forming a light screen that are realizedwithout a separate carrying rail in order to assure the stability of thelighting fixture or, respectively, of the light screen arrangement aswell as to accommodate the electrical and mechanical components. This isalso not provided given the inventive lighting fixture structure. Thesestructural functions are co-assumed by the design of the reflectorarrangement. This is possible in that the web-shaped material from whichthe reflector arrangement is manufactured is stiffened, for example bysurface shaping. A method disclosed by the International PatentApplication WO 94/22612 can, in particular, be advantageously utilizedfor this surface processing. In turns of fabrication technology, thereflector arrangement can thus also be cost-beneficially realized withknown tools. It is thus not only a light-oriented shaping element but astructural part at the same time that replaces a separate lamp housing.

It is thereby a particularly advantage to not only unite the reflectorarrangement and the carrying rail to form, for instance, a unit but tomanufacture these lighting fixture parts directly in one piece ofthin-walled flat material by appropriate shaping.

In fabrication-oriented terms, such a solution can be realized withoutfurther ado with rolling shaping systems that are standard in lightingtechnology and, thus, cost beneficially as well. These possibility ofbeing able to utilize this lighting fixture not only as a singlelighting fixture but also in a light screen arrangement is establishedby appropriate face end parts that are pluggable into one another bentover without requiring additional connector elements therefor in thiscase.

The inventive long field lighting fixture or fixtures with a linearlighting field should, for example, also be employable in therationalization of existing lighting systems in order to open up furtherpossible applications of this solution. According to a second exemplaryembodiment for a long field lighting fixture or fixtures with a linearlighting field capable of forming a light screen having a trough-shapedlamp housing securable to the ceiling of a room via suspensions and/ordirectly at whose end walls connector elements are provided foroptionally joining individual long field lighting fixtures directly toone another to form a light screen, this has

a single-piece reflector arrangement directly forming the lamp housingthat is fashioned mirror-symmetrically with reference to a verticalmiddle lamp plane containing the longitudinal lamp axis, said reflectorarrangement being fabricated of a thin-walled, web-shaped, reflectivematerial whose surface is finely structured in stiffening fashion bysurface shaping at least in sub-areas and, facing away from a light exitopening, comprises a pair of outwardly salient, mutually spaced legs forthe acceptance of electrical and/or mechanical lighting fixturecomponent parts;

further, respectively single-piece end wall parts whose inside facingtoward the reflector arrangement comprises a plug in channelcorresponding to the profile thereof; and

further, fastening clips that comprise a pair of fingers that,forceps-like and proceeding from the side of the legs of the reflectorarrangement, embrace the lateral surfaces thereof and form a receptaclefor lamp holders for cable or suspender suspensions or, respectively,serve for attaching the lighting fixture directly to the ceiling.

By contrast to the above-described embodiment, individual fasteningclips that can essentially be mounted at arbitrary locations in thelongitudinal extent of the lighting fixture are utilized in thissolution given an unmodified structural concept and appearance. Inparticular, this is also advantageous given rationalizations of oldlighting equipment because existing ceiling fasteners of the lightingfixture(s) can continue to be employed. Moreover, this addition recitesan alternative for the inventive lighting fixture capable of forming alight screen that satisfies the idea of a versatilely employable productfamily, as developments of both embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the fundamental structural format of aninventively fashioned lighting fixture with a reflector arrangement thatdirectly forms the lamp housing;

FIG. 2 is a view of an outer surface of an end face part of the lightfixture of FIG. 1;

FIG. 3 is a view of an inner surface of an end face part of FIG. 2;

FIG. 4 is a top plan view of the end face part of FIG. 2;

FIG. 5 is a top plan view illustrating how two end face parts can beplaced against one another with exact contours;

FIG. 6 is an end view of the housing with a clip for securing thefixture either directly to the ceiling or for suspension from theceiling;

FIG. 7 is a side view of the clip of FIG. 6;

FIG. 8 is an end view of an embodiment of a fastening clip for a furtherembodiment of such a fastening clip for mounting the lighting fixture ata carrying rail of a conventional light screen arrangement;

FIG. 9 is an end view of another connector element for lighting fixturescombined to form a light screen as an alternative to the end face partsaccording to one of the FIGS. 1 through 5;

FIG. 10 is an end view of an embodiment of the lighting fixture whereinthe light exit opening thereof is covered by a grid;

FIG. 11 is an end view of an embodiment of the lighting fixture with achannel mirror covering a light source in the direction toward the lightexit opening of the lighting fixture; and

FIG. 12 is and end view of another embodiment of the lighting fixture,whereby a covering of the light exit opening with a prism pane isprovided instead of a channel mirror.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the exemplary embodiment of a lighting fixture capable of forming alight screen shown in FIG. 1, a reflector arrangement 1 is fashionedmirror-symmetrically relative to a vertical center plane containing thelongitudinal lamp axis. It is shown by way of example that lateralsurfaces 11 or, respectively, 12 of the reflector arrangement arecomposed of planar sub-surfaces; these lateral surfaces 11 or,respectively, 12, however could likewise be fashioned as conicalsectional surfaces or, respectively, be composed of such surfaces. Thismeans that it is up to a person skilled in the art in this case toselect the profile design for these lateral surfaces 11 or,respectively, 12 for reasons of lighting technology.

An advantageous development of the reflector arrangement 1 is theprovision of the arrangement 1 with a small-area surface structure, atleast in sub-areas but also potentially completely. Methods for surfaceprocessing of web-shaped material are currently available andcost-beneficially enable a significant stiffening of the material. Interms of lighting technology, this means that the surfaces, for examplethe lateral surfaces 11 or, respectively, 12, of the reflectorarrangement 1 preferably diffusely reflect the light output by a bulbarranged in its inside. A certain homogenization of the light streamemitted by the lighting fixture can thus be achieved with this reflectordesign in terms of its spatial distribution. Mechanically, thestructuring of the surface of the reflector arrangement 1 has thefurther advantage that the rigidity thereof can be significantlyincreased when compared to a non-structured, smooth surface. Such astructuring thus also contributes to a considerable degree to thetransverse stability of the lighting fixture, so that the thickness ofthe material of the reflector arrangement 1 can be selectedcorrespondingly thinner in this case without a loss of stability.

In the region of a cover surface 13 that lies opposite the light exitopening 2, the reflector arrangement 1 comprises a pair of salient legs14 that are mirror-symmetrically arranged relative to the center planeof the lamp at a predetermined spacing from one another. These legs 14are respectively formed by two-fold bending of the web-shaped,thin-walled material of the reflector arrangement 1, where by thismaterial is preferably selected from among the standard reflectormaterials for lighting fixtures. Together with the cover surface 13 ofthe reflector arrangement 1, the two legs 14 thus form an essentiallyU-shaped channel closed on three sides whose longitudinal axis lies inthe center plane of the lamp and that is upwardly open facing away fromthe light exit opening 2. The interior of this channel is provided foraccepting electrical and mechanical component parts of the lightingfixture, for example an electronic ballast means as an operating devicefor the bulb(s) of the lighting fixture, for lamp sockets pluggedthrough the cover surface 13 as well as a lamp wiring. These details arenot shown in FIG. 1 for reasons of clarity since a person skilled in theart is aware of design solutions therefor, for example from theceiling/rail systems initially discussed.

In the embodiment shown in FIG. 1, terminating caps at the end faces ofthe reflector arrangement 1 are structurally fashioned such as end faceparts 3 that the lighting fixture becomes capable of forming a lightscreen. Viewed in cross-sectional profile, the end face parts 3 have amiddle region 31 that closes the channel formed by the legs 14 of thereflector arrangement 1 and tapers roughly triangularly downward in thedirection of the light exit opening 2 of the lighting fixture andthereby covers a lamp socket that cannot be seen in FIG. 1. Followingthe cross-sectional contour of the reflector arrangement 1, outwardlydirected fingers 32 are laterally applied to this middle region 31.

FIGS. 2 through 4 each respectively show a view of the outside or,respectively, inside as well as a plan view of the end face part 3 forillustrating details in a somewhat larger scale. Following the outsidecontour close to the edge, a narrow plug channel or groove 33 for theacceptance of the face profile of the reflector arrangement 1 isprovided at the inside—shown in FIG. 3—of the end face part 3. As aresult of the approximately true-to-scale illustration of the end facepart 3, this channel 33 can merely be seen in FIG. 3 as a somewhatthicker line. When assembling the lighting fixture, the face edge of thereflector arrangement 1 is inserted into this plug channel 33 andlatched thereat. A number of possibilities are available to the personskilled in the art as latch means, for example in the form offace-parallel slots in the reflector arrangement 1 with whichcorresponding catch noses in the end face part 3 correspond, so that nomore detailed explanation is required and a detailed illustration in thedrawing has been foregone. Further, the inside of the end face part 3comprises a circular segment-shaped recess 34 in its upper edge regionwhose significance as receptacle for a lamp holder shall be explainedlater.

It can also be seen in FIG. 2 and, in particular, in FIG. 4 that atongue and groove profile composed of a plurality of channels 35 or,respectively, tongues or keys 36 following one another in succession isprovided on the outside of the middle region 31 of the end face part 3,running parallel to the center plane of the lighting fixture. Thisprofile has a defined division grid, i.e. the channels 35 or,respectively, tongues 36 comprise approximately the same width, as wellas the same depth over and above this. In the overall impression of theillustrations in FIGS. 1 and 2, this tongue and groove profile 35, 36appears completely uniform, so that the outside of the end face part 3has a self-contained effect. When viewed more precisely, particularly onthe basis of FIG. 4, however, an asymmetrical offset relative to thecenter plane of the lighting fixture becomes clear, since the tongue andgroove profile terminates with a tongue or key at the left-hand edge ofthe middle region 31, whereas it terminates with an edge channel 35 atthe right-hand edge.

The reason for this asymmetrical arrangement of the tongue and grooveprofile 35, 36 of the middle region can be seen from FIG. 5. in thisillustration, two of the identically fashioned end face parts 3 areplaced opposite one another; it is clear therefrom that the tongue andgroove profiles 35, 36 of two end face parts 3 to be attached to oneanother, plugged into one another, enable an identically contouredjoining of the end face parts 3 without, for instance, an alignmentbeing required therefor.

The recess 34 in the form of a circular segment-shaped, cut blind holeshown in FIG. 3 is intended in this exemplary embodiment for acceptingthe lamp-side end piece of a lamp holder 4 forming a lighting fixturesuspension. This is fashioned as a circular disk in this embodiment thatcan be placed into the end face part 3 proceeding from the inside. Thelighting fixture suspension is shown as a wire-shaped suspender 5 by wayof example in FIGS. 1 and 2. The disk-shaped fashioning of the lampholder 4 allows the relative position thereof relative to the end facepart 3 to be set, for instance, in an angular range α—see FIG. 2. In anoperating position, a position swivelled out of the vertical positioncan therefore be selected for the lighting fixture within this range,insofar as this is desired for the room illumination on a case-by-casebasis. It is also schematically indicated in FIG. 2 that the relativeposition of the lighting fixture holder vis a vis the end face part 3 isnon-positively fixed with a grub screw 6. This is also to be understoodonly by way of example because it would also be conceivable withoutfurther ado to fashion the connection of the lamp holder 4 and end facepart 3 positively, for example with a denticulation.

FIGS. 1 and 2, finally, show that notches 41 are provided in the edgesurface of the lamp holder 4 projecting from the end face part 3. Givena light screen arrangement of the lighting fixture, these serve asreceptacles for a through wiring from a lighting fixture to a lightingfixture that can thus be simultaneously fixed.

A further embodiment of the lighting fixture is shown in profile or,respectively, in a portion of a side view in FIGS. 6 and 7. In amodification of the above-described embodiment, individual fasteningclips 7 are there by provided as lamp holder for a cable or suspendersuspension of the lighting fixture. each fastening clip has a coversurface 71 as well as two fingers 72 laterally projecting from thiscover surface 71 into which an inwardly disposed slot 73 is providedclose to their outer ends. The profile of the fingers 72 is matched tothe profile of the reflector arrangement 1, so that the fastening clip 7can be inverted over the outside of the reflector arrangement 1. In thisexemplary embodiment, the outside ends of the lateral surface 11, 12 ofthe reflector arrangement 1 are flanged outward and thus form lateralcatch edges 15. Further, the fastening clips 7 are fashioned as a sheetmetal part, whereby the cover surface 71 is composed of two planarelements bent at a right angle toward a respective side away from theplane of the legs 72.

During mounting of the fastening clip 7, the catch edges 15 of thereflector arrangement 1 snap into the respectively allocated slot 73 ofthe fastening clip 7. They are held in this position by a catchprojection 74 that is arranged at the outer ends of the fingers 72 ontheir inside and projects slightly beyond a bottom surface of the slot73. The cover surface 71 of the fastening clip 7 now serves in a knownway for the acceptance of a cable or suspender suspension of thelighting fixture. In the illustration selected in FIG. 6 or,respectively, 7, for example, a cable suspender 75 is provided thereforin which a lamp-side end of a cable (no longer shown) is to bedisplaceably fixed for ceiling compensation. It can be easily understoodby a person skilled in the art that the cover surface 71 of thefastening clip 7 can also be inherently fixed without further adodirectly to the ceiling of a room with a screw connection, so that nofurther example is required therefor.

FIG. 8 shows a further embodiment of the above-described fastening clip7. Given this embodiment of the fastening clip 7′, the clearcross-section of the space surrounded on three sides by the coversurface 71 and the adjacent foot ends of the fingers 72 is fashionedsuch that, in profile, it embraces a carrying rail 77 of one of theknown ceiling and rail systems for light screen arrangements. With thisembodiment of the fastening clip 7′, which is identical to the fasteningclip 7 described with reference to FIG. 6 in terms of its furtherfunction, it is possible to also utilize the lighting fixture describedhere in rationalizations of ceiling and rail systems wherein, as usual,a carrying rail 77 is used as the carrying element. As a schematicdetail, further, FIG. 8 shows an electronic ballast means 76 asoperating means for the described lighting fixture that is placed ontothe cover surface 13 of the reflector arrangement 1 arranged between itstwo legs 14.

FIG. 9 shows a further embodiment of the lighting fixture wherein, in amodification of the embodiment particularly described with reference toFIG. 4 and 5, the end face parts 3 themselves are not utilized forconnecting two or more individual lighting fixtures to form a lightscreen. On the contrary, an individual connector element 8 is utilizedfor the realization of this function. This is essentially composed oftwo clamps 81 and 82 that are fixed to one another by a screwedconnection 83, 84, 85. Each of the two clamps 81 and 82 of the connectorelement 8 comprises legs laterally crimped U-shaped by a plate servingfor the acceptance of the screwed connection 83 through 85. in the caseof the one clamp 81, the clearance between its legs is selected suchthat it can thus be respectively inserted into the profile or gap of thedoubly crimped legs 14 of the reflector arrangement 1. In amirror-symmetrical arrangement thereto, the second clamp 82 is placedbetween the two legs 14 of the reflector arrangement 1 with the ends ofits legs seated on the cover surface 13 of the reflector arrangement 1.The one clamp 81 of the connector element 8 thus embraces the coversurface 13 of the reflector arrangement 1 from below, whereas the otherclamp 82 thereof, guided at the insides of the legs 14 of the reflectorarrangement 1, sits on the cover surface 13 thereof. The screwedconnection between the two clamps 81 and 82 is then formed by aconnecting screw 83, a toothed washer 84 put in place thereon as well asa lock washer 85. the connecting screw 83 introduced together with thetoothed washer 84 in the one clamp 81 of the connector element 8 via abore (not shown) is held captive thereat with the lock washer 85. Whenthe connecting screw 85 is screwed into a threaded bore (likewise notshown) of the plate of the other clamp 82, the two clamps 81 and 82 ofthe connector element 8 are clamped against the reflector arrangement 1,particularly the cover surface 13 thereof, proceeding from two sides.

When the connector element 8 is arranged respectively overlapping theend or face region of two lighting fixtures placed directly against oneanother at the face side and is screwed in the described way in eachface region, then the two lighting fixtures are non-positively fixed toone another. In particular, the two lighting fixtures placed against oneanother are also in alignment in their longitudinal axis withoutadjustment because the one clamp 81 of the connector element 8 is guidedin the clearcross-section of the legs 14 of the reflector arrangement 1and the other clamp 82 has its slightly outwardly spread legs engagingat the bent edges between the cover surface 13 of the reflectorarrangement 1 and the legs 14 thereof.

The embodiment described above with reference to FIG. 8 for theconnection of two lighting fixtures placed against one another to form alight screen is to be advantageously applied instead of the firstembodiment described on the basis of FIGS. 1 through 5 when longer lightscreens or rows of lights are to be formed in this way and astructurally especially dependable lighting fixture connection seemsrequired in an application m a rough operating environment.

It should be added in view of lighting technology that theabove-described embodiments of the lighting fixture can, of course, becompleted by further accessory parts in order to realize lightdistributions adapted to an application. When desired, thus, thereflector arrangement 1 can be fashioned translucent, so that a part ofthe light emitted from a bulb inserted within the reflector arrangement1 there against passes through it and thus serves as secondary light,for example for ceiling illumination.

As schematically illustrated in FIG. 10, a grid for transverse deglaringcan be provided in the light exit opening 2 of the lighting fixture. Asin the embodiment described with reference to FIG. 6, the laterallyoutwardly flanged outside edges of the lateral surfaces 11, 12 of thereflector arrangement 1 can be utilized in this case to snap such a gridinto the light exit opening 2 of the lighting fixture and fix it inlatching fashion at the reflector arrangement 1.

For further augmentation, FIG. 11 schematically shows a furtherembodiment of the lighting fixture in cross-section. In this case, abulb, preferably a rod-shaped fluorescent bulb 9 is introduced into thereflector arrangement 1. In the direction of the light exit opening 2 ofthe lighting fixture, a channel mirror 92, that extends in the directionof the longitudinal axis of the lighting fixture and is thus alignedparallel to the bulb 9 and that partially coaxially embraces the bulb 9,is provided below the bulb 9. This channel mirror 92, which is fixed tothe bulb 9 in the exemplary embodiment, reflects light, which is emittedby the bulb 9 directly in the direction of the light exit opening 2 ofthe lighting fixture, against the reflector arrangement 1 and thus actsas a diffusor as well as an occlusion element for the bulb 9.

FIG. 12 schematically shows another possibility of glare reduction ofthe lighting fixture. In this case, the light exit opening 2 of thelighting fixture is covered by a prism pane 93. In a way similar to thatof the channel mirror 92 of FIG. 11, a light distribution is thuseffected by deflection of the light, which is emitted by the bulb 9directly in the direction of the light exit opening 2 of the lightingfixture, and this deflection reduces the great differences in luminousradiation that occur locally in the light exit opening 2 of the lightingfixture. In this case, too, longitudinal edges of the prism pane 93 canbe mounted in a holder 94 that, analogous to the fashioning of the outerends of the fingers 72 of the fastening clip 7 according to FIG. 6, isshaped such that a latched connection between the two lighting fixtureelements is enabled with a tongue and groove connection between theprism pane 93 and the reflector arrangement 1.

The embodiments, which are described above on the basis of the drawing,show that, based on a shared system concept with few, particularlyeconomical lighting fixture components, a family of lighting fixturescan be realized that can give a uniform appearance and can be used bothfor a new design and/or for a rationalization of a lighting system. Inaddition to the described embodiments, a person skilled in the art hasfurther possibilities available to adapt the lighting fixture design toboundary conditions of the application while developing the systemconcept. For achieving, for example, desired light distributioncharacteristics of the lighting fixture, he can thus adapt the profileof the reflector arrangement and/or change the position of the lampsused as light source relative to the reflector arrangement.

What is claimed is:
 1. A lighting fixture with a linear lighting field,said fixture being capable of forming a light screen, said fixturehaving a trough-shaped lamp housing securable to a ceiling of a room,said lamp housing being formed by a single-piece reflector arrangementthat is fashioned mirror-symmetrically with reference to a verticalmetal lamp plane containing the longitudinal lamp axis, said reflectorarrangement being fabricated of a thin-wall, web-shaped, reflectivematerial, whose surface is finely structured in a stiffening fashion bysurface shaping at least in sub-areas, said reflector arrangement, alongone side, having a light exit opening and, facing away from said lightexit opening, having a pair of outwardly salient mutually spaced legsfor acceptance of electrical and mechanical lighting fixture components,said housing having connector elements to provide an optional joining ofindividual fixtures directly to one another to form the light screen,said connector elements being formed as universal single-part end faceparts having inside surfaces facing the reflector arrangement comprisinga plug channel corresponding to a profile of the reflector arrangementand having an outside surface with a tongue and groove profile composedof a plurality of channels and tongues of identical width that extendparallel to one another as well as to the center plane of the lightingfixture and follow one another in alternation, said tongue and grooveprofile arrangement being asymmetrical to the center plane of thelighting fixture so that identically fashioned end face parts can bejoinable to one another at the outer surfaces in pairs and align theirrespective reflector arrangements.
 2. A lighting fixture according toclaim 1, wherein the outwardly salient legs of the reflector arrangementare fashioned as doubly flanged projections that together form anoutwardly open profile having a U-shaped cross-section.
 3. A lightingfixture according to claim 2, wherein the end face parts comprise aplate-shaped central region that embraces the U-shaped profile of thesalient legs of the reflector arrangement, said central region carryingthe tongue and groove profile on its outer surface facing away from thereflector arrangement and from which a pair of fingers project outwardlydownward fork-shaped for receiving the end edges of the reflectorarrangement.
 4. A lighting fixture according to claim 2, wherein the endpart comprises a recess in the region of the U-shaped profile legs on aninside surface and includes a lamp holder being introduced in saidrecess and forming a lamp-side end piece of a lighting fixturesuspension system.
 5. A lighting fixture according to claim 4, whereinthe lamp holders are fashioned as plate-shaped disks designed circularlyin cross-section.
 6. A lighting fixture according to claim 5, whereinthe recess in the end face part serves for acceptance of the lamp holderand is arranged to intersect an upper edge of the end face part, whereinthe lamp holder placed therein partially projects beyond the upper edgeof the end face part.
 7. A lighting fixture according to claim 6,wherein the lamp holder has notches provided on an edge regionprojecting from the upper edge of the end face part, said notchesserving for accepting and fixing a through-wiring from lighting fixtureto lighting fixture given a light screen arrangement.
 8. A lightingfixture according to claim 1, wherein the end face parts are fashionedas injection-molded parts.
 9. A lighting fixture according to claim 1,wherein catch means are provided for securing a plug connection betweenthe reflector arrangement and the end face parts.
 10. A lighting fixtureaccording to claim 1, which includes means for influencing the lightdistribution of the light passing through the light exit opening of thelight fixture, said means steering the light emitted by at least onerod-shaped bulb inside the reflector arrangement.
 11. A lighting fixtureaccording to claim 1, wherein the reflector arrangement is fashioned asa translucent member.
 12. A lighting fixture with a linear lightingfield, said fixture being capable of forming a light screen, saidfixture having a trough-shaped lamp housing securable to a ceiling of aroom, said lamp housing comprising a single-piece reflector arrangementthat is fashioned mirror-symmetrically with reference to a verticalmiddle lamp plane containing a longitudinal lamp axis, said reflectorarrangement being fabricated of a thin-wall, web-shaped, reflectingmaterial, whose surface is finely structured in a stiffening fashion bysurface shaping at least in sub-areas, said reflector arrangement, alongone side, having a light exit opening, and having a pair of outwardlysalient mutually spaced legs for acceptance of electrical and mechanicallighting fixtures facing away from said light exit opening, said housinghaving end face parts having inside surfaces facing toward the reflectorarrangement comprising a plug channel having a profile corresponding tothe profile of the reflector arrangement, and fastening clips comprisinga pair of fingers that embrace the lateral surfaces of the reflectorarrangement forceps-like proceeding from the side of the legs thereofand forming a receptacle for the light holder for securing the lightfixture into the ceiling.
 13. A lighting fixture according to claim 12,wherein the reflector arrangement is made of translucent material.
 14. Alighting fixture according to claim 12, which includes additional meansfor influencing the light distribution of the light passing through thelight exit opening of the lighting fixture, said means steering thelight emitted by at least one rod-shaped bulb arranged inside of thereflector arrangement.
 15. A lighting fixture according to claim 12,wherein the free edges of the lateral surfaces of the reflectorarrangement are flanged to form a catch edge, said fingers of thefastening clips adjacent the free ends having a slot for receiving thecatch edges for fixing in a latching fashion.
 16. A lighting fixtureaccording to claim 15, which includes connector elements for attachingtwo lamp housings in alignment, said connector elements having twoclamps fashioned U-shaped in cross-section, one of said clamps havinglegs guided in the profile of the doubly flanged legs of the reflectorarrangements and the other clamp being inserted in a clear cross-sectionbetween the legs of the reflector arrangements being mirror-symmetricalrelative to the first clamp, and means for a screw connection to clampthe two clamp elements together in a clamping fashion.
 17. A lightingfixture according to claim 12, which includes means for end faceconnection of a pair of housings with alignment, said means comprisingconnecting elements having two clamps fashioned U-shaped incross-section, one of said clamps having legs guided in the profile ofthe doubly flanged legs of the reflector arrangements and the otherclamp being inserted in the clear cross-section between the legs, andfastening means for securing the two clamp elements together in aclamping arrangement.